It's wrong because it breaks a basic grammar rule: We don't use the 'will' future in a future time clause starting with 'if'. This question is a standard conditional construction. There are two options: 1. The more direct option, using a zero or Type 0 conditional [present tense] + [if + present tense] "Do you mind if I open the door?" 2. The more tentative option, using a Type 2 conditional [would + base form] + [if + past/subjunctive] "Would you mind if I opened the door?" It's a simple formula, and you have to follow the correct sequence of tenses.

"If" iindicates a hypothetical situation, it could happen, or it could not. "will" indicates something that hasn't happened yet, but will. They seem to contradict each other, and it sounds strange.

Languages don't always have an answer to why things are done the way they are. This is from the online Cambridge dictionary: "When we ask for permission politely, we can use "would you mind if I + past" or "do you mind if I + present": Would you mind if I turned on this light? Do you mind if I sit here?"

If you will use it there, it's grammatically correct; but then again your interlocutor would feel uncomfortable.